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Senators Challenge GM's Barra, Push for Faster Change

GM Chief Pledges Top Executives Will Help Oversee Future Recalls

GM CEO Mary Barra explained that the "New GM" will be more ethical and transparent than it before as it deals with potentially criminal allegations of faulty ignitions causing at least 13 deaths and millions of vehicles recalled.

WASHINGTON—General Motors Co. Chief Executive Mary Barra withstood a second day of withering attacks from lawmakers with one senator saying the nation's largest auto maker should face criminal liability and another saying she needed to fix its "culture of coverup."

Testifying before a Senate subcommittee on Wednesday, Ms. Barra again sought to steer a careful course of contrition without admission. But she faced a panel...